Half to c



(No Model.)

P. M. BLAKE.

FRICTION OLUTOH.

Patented Feb. 10, 1885.

IFJIIFLE 5 5 E 5 II'LVEFLIUPY FRANCIS M. BLAKE, OF WORCESTER,MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO C. H. BLAKE AND D. D. BLAKE, OFSAME PLACE.

FRICTION-FCLUTCH.

SPECIFICATION forming part of Letters Patent No. 312,074, dated February10, 1885.

Application filed April 14, 1884. (No model.)

To all whom, it may concern/.-

Be it known that I, FRANCIS M. BLAKE, a citizen of the United States,residing at Worcester, in the county of Worcester and State ofMassachusetts, have invented a new and useful Improvement inFriction-Clutches, of which the following is a specification,accompanied by drawings illustrating a frictionclutch embodying myinvention, and in 0 which Figure 1 shows a side elevation of a sectionof shaft carrying a loose pulley having my improved friction-clutchattached, a portion of the rim of the pulley having been removed todisclose the clutch. Fig. 2 is a-sectional view on line m0, Fig. l,withthe carrier E removed,

showing the frictionring as applied to the hub,with the devices forcompressing thesame.

Fig. 3 is a sectional view of the friction-ring. Fig. 4 shows therotating spindle a. Figs. 5 and 6 are end and side views, respectively,of the carrier E.

Similar letters refer to similar parts in the several views.

My invention consists in the construction and arrangement of the severalparts as here inaiter set forth.

In Fig. 1, A denotes a section of shafting; B, a loose pulley on theshaft A, held in place on one side by the collar C. At one end of thehub of the pulley B is a frictionstrap, D, nearly inclosing the hub andopen at one side, with the lugs d d, Fig. 2. To the shaft A is attachedthe collar E, having an arm, I, overlapping the friction-ring D. On theside of the friction-ring D, and opposite the openings and lugs d d, isa spline, f, attached to the ring, said spline entering a correspondinggroove, r, in the arm I. Thus the collar D and arm I serve as a carrierto impart the rotation of the shaft to the friction-ring D, turning itabout the hub of the pulley, which may remain at rest. Through the lugsd and d, I pass a spindle, a, Fig. 4, having a head, H, whose inner sideis camshaped. The portion of the spindle passing through the lugs d andd is made round, so it may rotate in them, as

shown at It It, between the lugs (Z d. The

spindle is square, as at a, to receive the lever F, and the part at a,Fig. 4, is also made square to receive a cam, H, which is held againstthe lug d by a nut, e, on the screwthreaded portion m. A slidingconoidal frustum, G, on the shaft A serves to raise the lever F,rotating the spindle a and earns H and H, which, acting .againstcorresponding cam-surfaces on the outer sides of the lugs d and d,compress the friction-ring D upon the hub J of the pulley and cause therotation of the ring to be imparted to the pulley. By sliding the cone Gback the lever F will be allowed to fall, thereby removing the pressurefrom the lugs d d and allowing the frictionring D to turnagain freelyupon the hub J. To the inner side of one of the lugs (Z d, I at- 6 tacha lug, q, for the purpose of carrying a spring. p,which' acts upon theend of the lever F, holding the end 9 of the lever against the conicalsurface of G. Instead of rotating the shaft, the pulley B may be rotatedand its mo- 0 tion communicated to the shaft by means of the clutch, andinstead of the right and left cams H and H a cam maybe used on one sideor against but one of the lugs d (1. Any wear between the ring D and thehub J may he 7 taken up by means of the nut e on the spindle, bringingthe cams H H and lugs d d nearer together. Between the hub J and ring D,I place a copper ring, K, open at one side at t, held in place by thecarrier E on one side and by a shoulder on the hub. (Not shown in thedrawings.) This copper ring is loose about the hub when thefriction-ring D is not compressed, and is liable to be moved about thehub by contact with the rotating ring D, so that the surface of theintermediate ring is constantly changing with reference to the surfaceof the hub and that of the friction-ring D. By using a copper ring Iincrease the friction between the surfaces, as the friction between ironand copper surfaces is much greater than between two iron surfaces.

I do not confine myself to the special method shown of connecting theelastic ring D with the carrier, as other methods of connecting 5 thesame may be used, as forming a hole in the ring in the place of thespline f, and, in place of the grooved arm I, causing a pin to enter thehole attached to the collar E; or, in place of the spline f and groove1*, a'pin may be rigidly inserted in the arm I, entering a radial holein the elastic friction-ring D.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In a friction-clutch, the combination,with an elastic friction-strapconnected with the shaft and inclosing the'hub of the pulley, a rotatingcam-carrying bolt having a projecting lever acted on by a slidingcollar, whereby the friction-strap is compressed on the hub, of a lug,q, projecting from the friction-strap, and a spring supported by saidlug and acting on the projecting lever and rotating cam-bolt so as toreverse their action, as and for the purpose described.

2. In a friction-clutch, the combination,with an elastic friction-strapconnected with the shaft and inclosing the hub of the pulley, and havinglugs d d, of a rotating screw-threaded bolt passing through said lug,having a head resting against the outer side of one of the lugs d d, andhaving a squared section or sections, n, and connected projecting leverF, actuated by a sliding collar, of awasher sliding on a squared sectionof the bolt so it will rotate with it, and acting against the face ofone of the lugs d d, with a tightening-nut, 6, as and for the purposeset forth.

In a friction-clutch, the co1nbination,with a friction-strap inclosingthe hub of a pulley and connected with the shaft, and having lugs d d,and a rotating bolt with a head resting against the outside of one ofsaid lugs, of a sliding cam-shaped washer sliding on and rotating withsaid bolt and acting on a similar cam-surface on one of said lugs, andan adjusting-nut for determining the position of the cam-shaped washeron the rotating bolt, as and for the purpose set forth.

4. In afriction-clutch, the combination,with

a friction-strap, D, inclosing the hub of the groove, f, in thefriction-strap on the side opposite the ends of the friction-strap, sothe connection between the driving-plate and friction-strap is made atthat section of the strap where the motion caused by the expansion andcontraction of the strap is the least, as and for the purpose set forth.

5. In afriction-olutch, the'combination,with an elastic frictionstrapinclosing the hub of a pulley, of an elastic ring held between the huband the elastic friction ring, and being capable of turning within theinclosing-ring, so its position relative thereto may become changed, asand for the purpose set forth.

6. The combination, in a friction-clutch, of friction-strap D, havinglugs d, d, and q, rotating bolt having a projecting arm, F, actuated byasliding collar, sliding cam-washer H, adjusting-nut e, and spring 1), asand for the purpose set vforth.

FRANCIS M. BLAKE.

Witnesses:

RUFUS B. FOWLER, GEO. E. SMITH.

